Swollen lips may be caused by allergic reactions, injuries, chapping or sunburn, infections, and cysts called mucoceles. The swelling comes from either inflammation or built-up fluid under the skin.

Angioedema, a type of swelling that affects the skin and tissues of the body, commonly affects the lips. Angioedema is a type of swelling that affects the deep tissues of the skin and other systems.

A previously healthy, 14-year-old girl is admitted to the hospital after complaints of painful swelling of her lower lip, with periodic spotty, blood-tinged drainage from several discrete areas with ...